Are we allowed to write over the itinally defined registers ABC? I don't
think I have enough registers otherwise.

_______________________________________
Byron Cheng
byron@u.northwestern.edu
byroncheng@gmail.com
-----Original Message-----
From: owner-EECS203@listserv.it.northwestern.edu
[mailto:owner-EECS203@listserv.it.northwestern.edu] On Behalf Of Robert Dick
Sent: Thursday, May 22, 2008 10:47 AM
To: EECS203@listserv.it.northwestern.edu
Subject: Re: HW 6

Jeremy Meisel:
> I am having trouble writing the loop for number 5. I can increment, but I
> am unclear on how to write the code to do it n times. I am guessing it
> involves using blz and/or bz but I am unclear as to their syntax and how
> they work. Are Rt and Rc specific registers, or can they be any register?
> What does it mean for Rc < 0, do the registers hold signed numbers?
>
> Any help would be appreciated.

Jeremy stopped by to talk about this one. I suggested setting a register
to -count, incrementing it each time through the loop, and using the BLZ
instruction to get back to the top of the loop. You can add a label to the
code and move the label into a register when using the BLZ instruction. A
label can be treated just like a number.

-Robert Dick-
Received on Thu May 22 17:35:17 2008